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27 April 2024 |
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Article overview
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Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors | | Ying Xing
; Pu Yang
; Jun Ge
; Jiaojie Yan
; Jiawei Luo
; Haoran Ji
; Zeyan Yang
; Yongjie Li
; Zijia Wang
; Yanzhao Liu
; Feng Yang
; Ping Qiu
; Chuanying Xi
; Mingliang Tian
; Yi Liu
; Xi Lin
; Jian Wang
; | | Date: |
21 Jul 2020 | | Abstract: | The metallic ground state in two-dimensional (2D) superconductors,
characterized with saturated resistance when approaching absolute zero
temperature, has attracted much attention but is still under intense scrutiny.
Especially, the experimental measurements in ultralow temperature region are
challenging for 2D superconductors due to the sensitivity to external
perturbations. Here, we report electrical transport properties of 2D transition
metal dichalcogenide (TMD) superconductor 4Ha-TaSe2 flakes. Ising
superconductivity revealed by ultrahigh in-plane critical field (Bc2//) going
beyond the Pauli paramagnetic limit (Bp) is detected in 4Ha-TaSe2, in which
spins of the pairing electrons are strongly pinned by the effective Zeeman
field even in bulk situation due to the weak coupling between the TaSe2
sub-monolayers. In perpendicular magnetic field, the resistance saturation
state induced by external noise, named as "extrinsic anomalous metallic state",
is observed in 2D TaSe2 flakes. However, with further decreasing temperature
credible evidence of intrinsic anomalous metallic state is obtained by
adequately filtering external radiation. Our work indicates that at ultralow
temperatures the anomalous metallic state can be experimentally revealed in 2D
crystalline TMD superconductors as the quantum ground state by precise
measurement with high-attenuation low-pass filters. | | Source: | arXiv, 2007.10843 | | Services: | Forum | Review | PDF | Favorites | |
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